Adi Zafran made his toaster out of concrete blocks and rebar. He writes that he built it because pita bread is a staple food for him. Oh, I get it: It's like a little brick oven.

The toaster has just five components: rebar, part of a cinder block, wood, a wire, and fasteners. I'm not exactly sure how he gets the rebar hot enough to toast, but I imagine power travels through the rebar, and the resistance makes it heat up. And he seems to be in Israel, where outlets pack a 230-volt punch, which would help.